New review comment by ericonr on void-packages repository

https://github.com/void-linux/void-packages/pull/35059#discussion_r785480795

Comment:
https://github.com/archlinux/svntogit-packages/blob/packages/cantarell-fonts/trunk/PKGBUILD#L12

Uses `${version:0:5}` which looks like a great way to keep it future proof without hardcoding the version.